Bottles and jars – Closures – Having warning means or means impeding closure removal
Patent
1994-02-03
1998-06-09
Cronin, Stephen
Bottles and jars
Closures
Having warning means or means impeding closure removal
215217, 215277, B65D 5502
Patent
active
057622159
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a cap for a container, particularly a pharmaceutical container.
BACKGROUND OF THE INVENTION
British patent no. 2167050 relates to a two part child resistant pharmaceutical bottle cap which includes a hexagonal boss on the upper surface of the inner part which on depression of the outer part, locks into a hexagonal aperature in the top of the outer part. Twisting of the outer part in this locked position then releases the cap from the bottle. In the unlocked (child safety) position, however, there is a slight overlap between the uppermost edge of the boss and the innermost edge of the wall of the aperture, so that rotation of the outer part wears and rounds the corners of the boss eventually making it more difficult to lock with the aperture and thus release the cap.
In addition, some medicines are viscous which can result in the inner part becoming firmly stuck to the container. This leads to additional force being required to open the container which can speed up the wearing process.
SUMMARY OF THE INVENTION
Thus, the present invention provides a cap for a container having a screw threaded opening comprising an inner part in the form of a screw threaded cap, an outer part, the inner part being axially displaceable relative to the outer part and biased therefrom between an unlocking and locking position, resilient biasing means between the inner and outer parts, a boss, and engagement means adapted to engage with the boss upon depression of the outer part, a plurality of projections and a second engagement means adapted to engage with said plurality of projections upon depression of the outer part, such that turning the cap will unscrew it from the container, wherein one of the boss or engagement means is located on the top surface of the inner part and the other is located on the inner top surface of the outer part, and wherein one of the plurality of projections or second engagement means is located on the top surface of the inner part and the other is located on the inner top surface of the outer part.
In a preferred embodiment of the invention the boss is hexagonal and is located on the inner part and the engagement means consists of a plurality of spaced corner pieces located on the outer part.
Preferably the plurality of projections is located on the inner part and the second engagement means is located on the outer part.
In a particularly preferred embodiment the second engagement means consists of a plurality of dogs associated with the resilient biasing means.
In a third preferred embodiment the outer part of the cap has a substantially central aperture covered by a tamper evident cover connected to the outer part by a hinge portion and at least one frangible portion, and the boss carries a spigot which upon depression of the outer part projects through the aperture with sufficient force to break the least one frangible portions.
In another aspect the present invention provides a cap for a container having a screw threaded opening comprising an inner part, in the form of a screw threaded cap, an outer part, the inner part being axially displaceable relative to the outer part and biased therefrom between an unlocking and locking position, resilient biasing means between the inner and outer parts, a boss located on the inner part, a plurality of projections and engagement means adapted to engage with the projections upon depression of the outer part, wherein the outer part has a substantially central aperture into which the boss is received upon depression of the outer part, such that the boss engages with the aperture on unscrewing the cap.
In a preferred embodiment of this aspect of the invention the boss is hexagonal and the plurality of projections are located on the inner part and the engagement means on the outer part.
Preferably the engagement means consists of a plurality of dogs associated with the biasing means.
In a further preferred embodiment the aperture is covered by a tamper evident cover connected to the outer part by a hinge portion and at least one
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Cronin Stephen
Glaxo Wellcome
Newhouse Nathan
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